155503401 has 8 divisors (see below), whose sum is σ = 211749504. Its totient is φ = 101463120.

The previous prime is 155503393. The next prime is 155503441. The reversal of 155503401 is 104305551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155503401 - 2³ = 155503393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155503441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551290 + ... + 551571.

It is an arithmetic number, because the mean of its divisors is an integer number (26468688).

Almost surely, 2^155503401 is an apocalyptic number.

It is an amenable number.

155503401 is a deficient number, since it is larger than the sum of its proper divisors (56246103).

155503401 is a wasteful number, since it uses less digits than its factorization.

155503401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102911.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 155503401 is about 12470.1002802704. The cubic root of 155503401 is about 537.7494364891.

Adding to 155503401 its reverse (104305551), we get a palindrome (259808952).

The spelling of 155503401 in words is "one hundred fifty-five million, five hundred three thousand, four hundred one".